Frozen pollen

I found a site under www.tinkersgardens.com that discusses daylily hybridization, it is under daylily pages/daylily culture/pollen collecting & cold storage. Very interesting. Pollen must be dry & uncontaminated. Here they collected in a 3" X 3" post it note and folded, then in airconditioned space opened and dried for 4 hours before freezing. They hybridized after 9 yrs. of storage. Tom T. in MT.